package com.uchain.remarksystem.redis;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

import java.util.List;

@Service
public class RedisService {

    @Autowired
    JedisPool jedisPool;



    //清空缓存数据
    public void flush(){
        Jedis jedis = null;
        try {
            jedis = jedisPool.getResource();
            jedis.flushDB();
        }finally {
            returnToPool(jedis);
        }
    }


    //获取单个对象
    public <T> T get(KeyPrefix prefix,String key,Class<T> clazz){
        Jedis jedis = null;
        try {
            jedis = jedisPool.getResource();
            //生成真正的key
            String realKey = prefix.getPrefix() + key;
            String str = jedis.get(realKey);
            T t = stringToBean(str,clazz);
            return t;
        }finally {
            returnToPool(jedis);
        }
    }
    //设置单个对象
    public <T> boolean set(KeyPrefix prefix,String key,T value){
        Jedis jedis = null;
        try {
            jedis = jedisPool.getResource();
            String str = beanToString(value);
            if (str==null||str.length()<=0){
                return false;
            }
            //生成真正的key
            String realKey = prefix.getPrefix() + key;
            int seconds = prefix.expireSeconds();
            //判断是否是永不过期的从而调用不同的jedis方法
            if (seconds<=0){
                jedis.set(realKey,str);
            }else {
                jedis.setex(realKey,seconds,str);
            }
            return true;
        }finally {
            returnToPool(jedis);
        }
    }

    //判断是否存在
    public <T> boolean exist(KeyPrefix prefix,String key){
        Jedis jedis = null;
        try {
            jedis = jedisPool.getResource();
            //生成真正的key
            String realKey = prefix.getPrefix() + key;
            return jedis.exists(realKey);
        }finally {
            returnToPool(jedis);
        }
    }

    //删除
    public <T> boolean delete(KeyPrefix prefix,String key){
        Jedis jedis = null;
        try {
            jedis = jedisPool.getResource();
            //生成真正的key
            String realKey = prefix.getPrefix() + key;
            long ret = jedis.del(realKey);
            return ret > 0;
        }finally {
            returnToPool(jedis);
        }
    }

    //增加
    public <T> Long incr(KeyPrefix prefix,String key){
        Jedis jedis = null;
        try {
            jedis = jedisPool.getResource();
            //生成真正的key
            String realKey = prefix.getPrefix() + key;
            return jedis.incr( realKey);
        }finally {
            returnToPool(jedis);
        }
    }

    //减少
    public <T> Long decr(KeyPrefix prefix,String key){
        Jedis jedis = null;
        try {
            jedis = jedisPool.getResource();
            //生成真正的key
            String realKey = prefix.getPrefix() + key;
            return jedis.decr( realKey);
        }finally {
            returnToPool(jedis);
        }
    }


    public static <T> String beanToString(T value) {
        if (value==null){
            return null;
        }
        Class<?> clazz = value.getClass();
        if (clazz==int.class||clazz==Integer.class){
            return ""+value;
        }else if (clazz==String.class){
            return (String) value;
        }else if (clazz==long.class||clazz==Long.class){
            return ""+value;
        }else if (clazz==List.class){
            return ""+JSONArray.toJSONString(value);
        }else {
            return JSON.toJSONString(value);
        }

    }

    public static  <T> T stringToBean(String str,Class<T> clazz) {
        if (str==null||str.length()<=0){
            return null;
        }
        if (clazz==int.class||clazz==Integer.class){
            return (T) Integer.valueOf(str);
        }else if (clazz==String.class){
            return (T) str;
        }else if (clazz==long.class||clazz==Long.class) {
            return (T) Long.valueOf(str);
        }else if (clazz==List.class){
            return JSONArray.parseObject(str,clazz);
        } else {
            return JSON.toJavaObject(JSON.parseObject(str),clazz);
        }
    }

    private void returnToPool(Jedis jedis) {
        if (jedis!=null){
            jedis.close();
        }
    }


}
